Symptoms
The rear glass won't drop, so the tailgate can't be opened, or the glass binds and stalls. On 1970–83 trucks the key switch could stick on (recall 87V-178).
The fix, step by step
- Test the dash switch and the key switch in the tailgate first.
- If the motor hums but nothing moves, lower the glass by hand, open the inner panel and inspect the lifter cushions, lifter bar and glass channels.
- Replace worn cushions and channels, lube the tracks, and fit a new switch kit if the old one is intermittent.
- Ask a dealer whether the recall work was ever done.
Tools & part numbers
- Trim tools
- test light or multimeter
- sockets
- silicone or lithium lube
Where to buy the parts
Tailgate glass window switch kit, 1974–1991Team Grand Wagoneer ↗Amazon ↗
Tailgate window lifter cushion, 1968–1978Team Grand Wagoneer ↗Amazon ↗
Tailgate window lifter cushion, 1979–1991Team Grand Wagoneer ↗Amazon ↗
Tailgate glass window channel, 1968–1991Team Grand Wagoneer ↗Amazon ↗
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Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.